Magnetic stirrer

Abstract

A magnetic stirrer (11) comprises a magnetic drive and a placement surface (17) for a laboratory vessel containing a substance to be stirred. The magnetic drive is designed to generate a magnetic field which varies such that a magnetic stirring element can be driven to produce a stirring motion in the laboratory vessel, in order to stir the substance. The magnetic stirrer (11) also comprises a heating device (15), which is designed to heat the placement surface in order to heat up the substance, and a display device (23), which is designed to display the current temperature of the placement surface.

The invention claimed is: 
     
       1. A magnetic stirrer comprising:
 a magnetic drive and a placement surface for a laboratory vessel; said laboratory vessel, containing therein a substance to be stirred, wherein the magnetic drive is configured to generate a magnetic field varying such that a magnetic stirring element positioned in the laboratory vessel can thereby be driven to make a stirring movement to stir the substance; 
 a heating apparatus that is configured to heat the placement surface to heat the substance; and 
 a display apparatus comprising an illumination element controllable to transmit light; said display apparatus configured to display a respective temperature state of the placement surface, to control the illumination element to transmit light having respectively different illumination characteristics for the display of different temperature states of the placement surface and/or of different heating states of the heating apparatus, and to control the illumination element to transmit pulsing light of different pulse frequencies for a combined display of a switched off state of the heating apparatus and of different hot states of the placement surface. 
 
     
     
       2. The magnetic stirrer in accordance with  claim 1 ,
 wherein the display apparatus is configured to control the illumination element to transmit light in accordance with a first illumination characteristic for a display of a switched on state of the heating apparatus; to control the illumination element to transmit light in accordance with a second illumination characteristic for a combined display of a switched off state of the heating apparatus and of a hot state of the placement surface; 
 and/or to control the illumination element to transmit light in accordance with a third illumination characteristic for a combined display of a switched off state of the heating apparatus and of a cool state of the placement surface. 
 
     
     
       3. The magnetic stirrer in accordance with  claim 2 ,
 wherein the display apparatus is configured to control the illumination element to transmit constantly illuminating light for the display of the switched on state of the heating apparatus. 
 
     
     
       4. The magnetic stirrer in accordance with  claim 2 ,
 wherein the display apparatus is configured to control the illumination element to transmit pulsing light for the combined display of the switched off state of the heating apparatus and of the hot state of the placement surface. 
 
     
     
       5. The magnetic stirrer in accordance with  claim 2 ,
 wherein the display apparatus is configured to control the illumination element to transmit no light for the combined display of the switched off state of the heating apparatus and of the cool state of the placement surface. 
 
     
     
       6. The magnetic stirrer in accordance with  claim 2 ,
 wherein the display apparatus is configured to control the illumination element to transmit constantly illuminating light for the display of the switched on state of the heating apparatus; to control the illumination element to transmit pulsing light for the combined display of the switched off state of the heating apparatus and of the hot state of the placement surface; and/or to control the illumination element to transmit no light for the combined display of the switched off state of the heating apparatus and of the cool state of the placement surface. 
 
     
     
       7. The magnetic stirrer in accordance with  claim 1 ,
 wherein respective illumination characteristics for displaying different temperature states of the placement surface differ with respect to a pulse frequency, a color and/or a brightness of the respective light transmitted by the illumination element. 
 
     
     
       8. The magnetic stirrer in accordance with  claim 1 ,
 wherein the magnetic stirrer comprises an actuation element, with the display apparatus being provided at the actuation element. 
 
     
     
       9. The magnetic stirrer in accordance with  claim 1 ,
 wherein the magnetic stirrer comprises a temperature sensor for detecting a respective temperature of the placement surface, 
 with the display apparatus being configured to determine and display the respective temperature state of the placement surface in dependence on the respective temperature detected by means of the temperature sensor. 
 
     
     
       10. The magnetic stirrer in accordance with  claim 1 ,
 wherein the magnetic stirrer comprises a base unit having a power supply for the magnetic drive, for the heating apparatus, and for the display unit, 
 with the heating apparatus being formed separately from the base unit, and being arranged at the base unit, and having the placement surface; 
 and with the display apparatus being provided at the base unit. 
 
     
     
       11. The magnetic stirrer in accordance with  claim 10 ,
 wherein the heating apparatus is a hotplate. 
 
     
     
       12. The magnetic stirrer in accordance with  claim 1 , further comprising: an actuation element for switching and/or adjusting the heating apparatus, wherein the actuation element is a single element including a rocker switch, a push button, a rotary knob, a touch-sensitive input element, or similar; and a display apparatus arranged to encompass the actuation element; said display apparatus configured to display a respective temperature state of the placement surface and to display a respective heating state of the heating apparatus. 
     
     
       13. The magnetic stirrer in accordance with  claim 1 , further comprising: an actuation element for switching and/or adjusting the heating apparatus; wherein the display apparatus is integrated in the actuation element and the actuation element is a single element including a rocker switch, a push button, a rotary knob, a touch-sensitive input element, or similar.